I always appreciate caution, but unless Nokia got a special 3430 chipset that is "weaker" than the ones in the Archos 5 and Sammy / Motorola phones, 800mhz is well within the operational ceiling of the chipset. The one caveat is if the cooling solution in the N900 is weaker than those units, but I notice zero temperature difference between 800mhz and 600mhz.